内蒙古朱拉扎嘎金矿构造、岩浆控矿作用

STRUCTURAL AND MAGMATIC CONTROL OF THE ZHULAZHAGA GOLD DEPOSIT IN INNER MONGOLIA

朱拉扎嘎金矿位于中新元古代巴音诺尔公凹陷带内,朱拉扎嘎毛道附近南北向背斜褶皱轴部及朱拉扎嘎毛道NNW向断裂构造南段,赋存在中元古界蓟县系阿古鲁沟组一岩段中,为岩浆热液蚀变岩型金矿床.通过研究朱拉扎嘎金矿区域构造演化及构造、岩浆岩的控矿作用,提出朱拉扎嘎金矿床控矿因素为E-W向逆冲断裂带活动派生出的层间滑动破碎带,与华力西期岩浆活动有密切关系.区域上北东方向的呼布和特一带与朱拉扎嘎金矿床地质情况相似,是该区的找矿重点方向.

The Zhualazhaga gold deposit is situated in the Meso-Neoproterozoic Bayinnuoergong depression belt, at the NS-trending axis of anticline and in the southern part of NNW-trending fault. The ores occur in the first member of Agulugou Formation, Jixian System, Mesoproterozoic Erathem. The deposit is of magmatic hydrothermal altered rock type. With study on the regional tectonic evolution, and structural and magmatic rock control, it is concluded that the ore-controlling factor of Zhulazhaga gold deposit is the interlayer-gliding fracture zone derived from E-W-trending reverse thrust, which is closely related with Variscan igneous activity. The study also shows that the geological conditions on the northeastern area are similar to those of the Zhulazhaga gold deposit, suggesting that it should be the target for exploration.